Although I have never bought a car from Volkswizard I know the website you are on about. To be honest I think much of the info on the site is probably true. Having been a reader of VW Driver magazine in the past the guy who runs Volkswizard has appeared in there many times with some mint example Mk2s which he owns. From that I think it is true to say he is definitely an enthusiast but naturally you have to be wary with some dealers. Also the editor of the magazine, Neil Birkett, has recently bought a Mk4 GTI as a new project car from Volkswizard (part-exed a MK3 GTI), and so I am sure if the dealer was dodgy they would publicise it in the magazine. Like I said I have had no personal dealings, but info seems to be positive.